During the pressure hull manufacturing, processes like cold bending and welding are often applied. These processes lead to permanent plastic deformations which are associated with residual stresses. The presence of residual stresses is equivalent to the introduction of an initial preload in the structure, which accelerates the plastification process, decreasing pressure hull resistance. To quantify this reduction, a case study that considers residual stresses due to cold bending on hull plates and frame flanges had been performed using finite element models. The study encompasses hull diameters of 6, 8, and 10 m with hull plates and frame flange thickness from 20 to 30 mm, with HY100 steel. Finite element numerical analyses were done considering material and geometric nonlinearities. First, the cold bending residual stresses were determined using finite element models. Then, these cold bending residual stresses were introduced as initial stresses in the submarine pressure hulls' finite element models. In the end, it was possible to verify that the presence of cold bending residual stress reduces the submarine hull collapse pressure up to 4.3%.

References

References
1.
Burcher
,
R.
, and
Rydill
,
L.
,
1998
,
Concepts in Submarine Design
,
Cambridge University Press
,
Cambridge, UK
, Chap. 1.
2.
Banks
,
E.
, and
Kugles
,
G.
,
1986
, “
Modular Construction of Submarines Using Mechanized Welding
,”
34th National Welding Conference and Exhibition
, Vol.
31
, pp.
153
172
.
3.
Masabuchi
,
K.
,
1980
,
Analysis of Welded Structures: Residual Stresses, Distortion and Their Consequence
,
Pergamon Press
,
New York
, Chap. 13.
4.
Kirstein
,
A.
, and
Slankard
,
R.
,
1957
, “
An Experimental Investigation of the Shell-Instability Strength of a Machined, Ring-Stiffened Cylindrical Shell Under Hydrostatic Pressure (Model BR-4A)
,” David Taylor Model Basin, Washington, DC, Report No. 997.
5.
Krenzke
,
M.
,
1960
, “
Effect of the Initial Deflection and Residual Welding Stresses on Elastic Behavior and Collapse Pressure of Stiffened Cylinders Subjected to External Hydrostatic Pressure
,” David Taylor Model Basin, Washington, DC, Report No. 1327.
6.
Bushnell
,
D.
,
1980
, “
Effect of Cold Bending and Welding on Buckling of Ring-Stiffened Cylinders
,”
Comput. Struct.
,
12
(
3
), pp.
291
307
.
7.
Graham
,
D.
,
2007
, “
Predicting the Collapse of Externally Pressurised Ring-Stiffened Cylinders Using Finite Element Analysis
,”
Mar. Struct.
,
20
(
4
), pp.
202
217
.
8.
Cerik
,
C.
, and
Cho
,
S.
,
2013
, “
Numerical Investigation on the Ultimate Strength of Stiffened Cylindrical Shells Considering Residual Stresses and Shakedown
,”
J. Mar. Sci. Technol.
,
18
(
4
), pp.
524
534
.
9.
Gannon
,
L.
,
2010
, “
Prediction of the Effects of the Cold Bending on Submarine Pressure Hull Collapse
,” Defence R&D Canada—Atlantic, Technical Report No. TM-2010-065.
10.
Forsback
,
H.
, and
Johansson
,
J.
,
2001
, “
Simulation and Testing of GPHE Channel Plates During Assembling
,” Master dissertation, Universidad de Lund, Lund, Sweden.
11.
Arpin
,
K. R.
, and
Trimble
,
T. F.
,
2003
, “
Material Properties Test to Determine Ultimate Strain and True Stress-True Strain Curves for High Yield Steels
,” General Dynamics,
Technical Report No. TDA 19184
.
12.
Lennon
,
F.
,
2006
, “
The Effects of Cold Forming and Welding Residual Stress States on the Buckling Resistance of Orthogonally Stiffened Cylinders
,”
Appl. Mech. Mater.
,
5
, pp.
509
518
.
13.
ANSYS
,
2014
, “
Mechanical APDL Version 15
,” ANSYS, Houston, TX.
14.
Robertson
,
I. M.
,
1991
, “
Analytical Calculations of Fatigue Loading of Submarine Hulls
,” Materials Research Laboratory, Maribyrnong, VIC,
Technical Report No MRL-TR-90-26
.
15.
Kendrick
,
S.
,
1970
, “
Externally Pressurized Vessels
,”
The Stress Analysis of Pressure Vessels and Pressure Vessels Components
,
Pergamon Press
,
New York
, pp.
405
511
.
16.
Kukbin
,
K.
, and
Park
,
J.
,
2003
, “
A Study on Effects of Initial Deflection on Ultimate Strength of Ring-Stiffened Cylindrical Structure Under External Hydrostatic Pressure
,”
Thirteenth International Offshore and Polar Engineering Conference
, Honolulu, HI, pp.
415
422
.
17.
Prabu
,
B.
,
Rathinam
,
N.
,
Srinivasan
,
R.
, and
Naarayen
,
K.
,
2009
, “
Finite Element Analysis of Buckling of Thin Cylindrical Shell Subjected to Uniform External Pressure
,”
J. Solid Mech.
,
1
(
2
), pp.
148
158
.
18.
Mackay
,
J.
,
2007
, “
Structural Analysis and Design of Pressure Hulls: The State of the Art and Future Trends
,” Defence R&D Canada—Atlantic, Technical Report No. TM-2007-188.
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